Google最近发布了Tensorflow Lite，并且提供了demo，虽然该demo可以使用bazel build –cxxopt=’–std=c++11’ //tensorflow/contrib/lite/java/demo/app/src/main:TfLiteCameraDemo命令成功编译出来，但是文档中并没有提及如何纯粹的编译出动态库，参考之前的一篇文章《当 Android 开发者遇见 TensorFlow》，这篇文章就简单介绍一下如何编译动态库
clone 代码
|
1
|
修改TensorFlow项目根下的WROKSPACE文件
将以下代码反注释
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
|
# Uncomment and update the paths in these entries to build the Android demo.
android_sdk_repository(
name =
"androidsdk",
api_level = 23,
# Ensure that you have the build_tools_version below installed
in the
# SDK manager as it updates periodically.
build_tools_version =
"26.0.1",
# Replace with path
to Android SDK on your system
path =
"/Users/lizhangqu/AndroidSDK",
)
#
android_ndk_repository(
name=
"androidndk",
path=
"/Users/lizhangqu/AndroidNDK/android-ndk-r14b",
# This needs
to be 14
or higher
to compile TensorFlow.
# Please specify API level
to >= 21
to build
for 64-bit
# archtectures
or the Android NDK will automatically select biggest
# API level that it supports without notice.
#
Note that the NDK version is
not the API level.
api_level=14)
|
然后修改android_sdk_repository中的path为自己电脑中的android sdk目录，修改android_ndk_repository中的path为自己电脑的android ndk目录。
值得注意的是，ndk的版本，官方建议使用大于r14的版本，下载地址android-ndk-r14b-darwin-x86_64.zip
编译
确保必要的工具已经安装，如bazel
|
1
2
3
4
|
bazel build --cxxopt='--std=c++11' //tensorflow/contrib/lite/java:tensorflowlite \
-
-crosstool_top=//external:android/crosstool \
--host_crosstool_top=@bazel_tools//tools/cpp:toolchain \
--cpu=armeabi
|
编译其他ABI请修改cpu参数，分别为
|
1
2
3
4
5
6
7
|
--cpu=armeabi
--cpu=armeabi-v7a
--cpu=arm64-v8a
--cpu=mips
--cpu=mips64
--cpu=x86
--cpu=x
86_64
|
产物位于
|
1
2
|
bazel-bin
contrib
java/libtensorflowlite_jni.so
bazel-bin
contrib
java/libtensorflowlitelib.jar
|
注意编译mips和mips64的时候，需要将构建脚本稍微修改一下，删除一部分代码，否则会报错
找到/tensorflow/contrib/lite/build_def.bzl文件，找到如下代码
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
def tflite_linkopts_unstripped():
"""Defines linker flags to reduce size of TFLite binary.
These are useful when trying to investigate the relative size of the
symbols in TFLite.
Returns:
a select object with proper linkopts
"""
return select({
"//tensorflow:android": [
"-Wl,--no-export-dynamic",
# Only inc syms referenced by dynamic obj.
"-Wl,--exclude-libs,ALL",
# Exclude syms in all libs from auto export.
"-Wl,--gc-sections",
# Eliminate unused code and data.
"-Wl,--as-needed",
# Don't link unused libs.
],
"//tensorflow/contrib/lite:mips": [],
"//tensorflow/contrib/lite:mips64": [],
"//conditions:default": [
"-Wl,--icf=all",
# Identical code folding.
],
})
def tflite_jni_linkopts_unstripped():
"""Defines linker flags to reduce size of TFLite binary with JNI.
These are useful when trying to investigate the relative size of the
symbols in TFLite.
Returns:
a select object with proper linkopts
"""
return select({
"//tensorflow:android": [
"-Wl,--gc-sections",
# Eliminate unused code and data.
"-Wl,--as-needed",
# Don't link unused libs.
],
"//tensorflow/contrib/lite:mips": [],
"//tensorflow/contrib/lite:mips64": [],
"//conditions:default": [
"-Wl,--icf=all",
# Identical code folding.
],
})
|
将上面代码中的下面这段删除
|
1
2
3
4
5
6
|
"//tensorflow:android": [
"-Wl,--no-export-dynamic",
# Only inc syms referenced by dynamic obj.
"-Wl,--exclude-libs,ALL",
# Exclude syms in all libs from auto export.
"-Wl,--gc-sections",
# Eliminate unused code and data.
"-Wl,--as-needed",
# Don't link unused libs.
],
|
以及这一段也删除
|
1
2
3
4
|
"//tensorflow:android": [
"-Wl,--gc-sections",
# Eliminate unused code and data.
"-Wl,--as-needed",
# Don't link unused libs.
],
|
临时删除后，编译完mips和mips64还原即可，不然会报如下错误
|
1
2
3
4
5
6
7
8
9
10
|
ERROR:
/Users/lizhangqu
/Desktop/tensorflow
/tensorflow/contrib
/lite/java
/BUILD:133:1: Illegal ambiguous match on configurable attribute "linkopts" in /
/tensorflow/contrib
/lite/
java:libtensorflowlite_jni.
so:
//tensorflow/contrib/lite:mips
//tensorflow:android
Multiple matches are not allowed unless one is unambiguously more specialized.
ERROR: Analysis of target
'//tensorflow/contrib/lite/java:tensorflowlite' failed; build
aborted:
/Users/lizhangqu
/Desktop/tensorflow
/tensorflow/contrib
/lite/java
/BUILD:133:1: Illegal ambiguous match on configurable attribute "linkopts" in /
/tensorflow/contrib
/lite/
java:libtensorflowlite_jni.
so:
//tensorflow/contrib/lite:mips
//tensorflow:android
Multiple matches are not allowed unless one is unambiguously more specialized.
|
|
1
2
3
4
5
6
7
8
9
10
|
ERROR:
/Users/lizhangqu
/Desktop/tensorflow
/tensorflow/contrib
/lite/java
/BUILD:133:1: Illegal ambiguous match on configurable attribute "linkopts" in /
/tensorflow/contrib
/lite/
java:libtensorflowlite_jni.
so:
//tensorflow/contrib/lite:mips64
//tensorflow:android
Multiple matches are not allowed unless one is unambiguously more specialized.
ERROR: Analysis of target
'//tensorflow/contrib/lite/java:tensorflowlite' failed; build
aborted:
/Users/lizhangqu
/Desktop/tensorflow
/tensorflow/contrib
/lite/java
/BUILD:133:1: Illegal ambiguous match on configurable attribute "linkopts" in /
/tensorflow/contrib
/lite/
java:libtensorflowlite_jni.
so:
//tensorflow/contrib/lite:mips64
//tensorflow:android
Multiple matches are not allowed unless one is unambiguously more specialized.
|